Bench-vise



\ A E a John/l kflwre movnq (No Model.)

Patented Sept. 29, 1896. I

UNITED STATES ATENT Fries.

JOHN WV. MOINTYRE, OF PHILADELPHIA, PENNSYLVANIA.

BENCH-VISE.

SPECIFICATION forming part of Letters Patent No. 568,364, dated; September 29, 1896. Application filed December '7, 1895. Serial No. 571,415. (No model) T aZZ whom, it 'ntrty/ concern.-

Be it known that I, JOHN W. MCINTYRE, a citizen of the United States,residing at Phila delphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Bench- Vises, of which the following is a specification.

My invention relates to a new and useful improvement in bench-Vises, and especially to that class known as sliding-jaw vises, and has for its object to provide such a device which may be partly operated by the foot and partly by the hand, whereby the sliding jawmay be moved to and fro in elfecting the initial hold upon the work to be clamped, so that the hands of the operator are left free to properly adjust the work between the jaws before final clamping takes place.

Vith these ends in view the invention consists in the details of construction and comv bination of elements hereinafter set forth and then specifically designated bythe claims.

In order that those skilled in the art to which my invention appertains may understand how to make and use the same, I will describe its construction and operation in detail, referring by numbers to the accompanying drawings,-forming a part of this specification, and in which Figure 1 is a vertical section of my improvement, showing the mechanism and operative parts thereof; Fig. 2, a detail fragmentary view of the cam-surfaces by which the lost motion of the operating-screw is taken up; and Fig. 3 is a detail view of the nut, showing the operating-screw in section therein.

Similar numbers denote like parts in the views of the drawings.

1 represents the body of the vise, having formed therewith the stationary jaw 2, and 3 is the sliding jaw, adapted to move back and forth upon suitable ways 4; but as these features are well known and form no part of my present'improvement I will not enter into a detailed description thereof.

5 is a nut adapted to be secured to the rear portion of the sliding jaw within a suitable slot 6. The threads of this nut are cut away at 7, so that the flattened operating-screw 8 may slide back and forth within said nut when in the position shown in Figs. 1 and 3 without engaging the threads thereof.

9 is a two-faced cam form ed upon the front of the stationary jaw, and 10 is a similar cam formed upon the collar 11, which is secured by the pin 12 to the outer end of the operating-screw 8. To this collar is secured the ordinary handle 13, and 14 is a collar secured upon the shank of the screw 8 to prevent withdrawal of the latter from the stationary jaw. Projecting from the under side of the sliding jaw are a number of teeth 15, with which the teeth 16 of the segment 17 mesh. This segment is pivoted at 18 within the body of the vise and is provided with an arm 19, which extends without said body, and 20 is a rod pivoted to the outer end of said arm and extending downward, terminating in a stirrup 21. To the arm 20 is pivoted a oounterpoise-lever 22, which in turn is adjustably pivoted in holes 23 of the bracket 24, which is secured to the under side of the bench 25 by suitable bolts.

26 is a weight formed upon't-he outer end of the lever 22 or secured thereto, and is of sufficient weight to overcome the weight of the stirrup and rod 20 and force the sliding jaw backward to its normal distended position.

From this description the operation of my improvement is as follows: The operator desiring to clamp a piece of work between the jaws of the vise places said work in the desired position and exerts sufficient pressure upon the stirrup to draw the sliding jaw forward against the work with sufficient force to hold said work until the operating-screw can be manipulated, when by grasping the handle 13 said screw is given a partial turn upon its axis, whereby its threads arecaused to engage the threads of the nut, so that any further rotation of the screw will draw the sliding jaw with increasing firmness against the work; but should the work be of such thickness without the sliding jaw, when brought in contact therewith by the pressure of thefoot,asbefore described,thatthe threads of the screw should not match with the threads of the nut their engagement may be effected by a slight longitudinal movement of said screw, which will be permitted by the lost motion between the collar 14 and the stationary jaw, and when the screw and nut have been engaged this lost motion will be taken up by the action of the cam 10 against the cam 9 in the rotation of the former with the screw, so that it will be seen that work of slightly-varyin g thicknesses may at all times be firmly clamped between the jaws of the vise, which is not the case with sliding-jaw Vises of the ordinary constructions.

Another advantage of my improved construction is that in releasing the work by a reverse movement of the handle the coaction of the cams will permit this sliding jaw to move backward sufficiently to release the work before the threads of the screw become disengaged from the threads of the nut, and this is of considerable importance, in that the work is thereby released with a uniform action, which would not be the case were it to remain clamped until the screw and nut were disengaged.

A further advantage is that the same work or work of a slightly-varying thickness may be clamped and unclamped without disengaging the threads of theserew and nut, in that the combined action of said threads and the cams is sufficient to move the sliding jaw to and fro to a degree sufficient to accomplish this result.

Having thus fully described my invention, what I claim as new and useful is 1. In a device of the characterdescribed, a stationary jaw, a movable jaw, a flattened screw journaled in said stationary jaw, a re cessed nut carried by said movable jaw and engaging said screw, a cam-surface on the stationary jaw, a cap on the screw having a camsurface to fit the other cam-surface and a collar on the screw limiting the action of the cams, as and for the purpose described.

2. In a device of the character described, a base, a stationary jaw, a movable jaw, and means for actuating the movable jaw consisting of a toothed rack on the movable jaw, a toothed segment pivoted to the base, a rod hinged to an arm of said segment and carrying a stirrup on its end, a lever hinged at one end to said rod and carrying 011 its other end a weight said lever adjustably pivoted to a depending rod, as and for the purpose described.

In a device of the character described, a base, a stationary jaw, a movable jaw, a flattened screwjournaled in said stationary jaw, a recessed nut carried by said movable jaw, and engaging said screw, a cam-surface on the stationary jaw, a cap on the screw having a cam-surface to fit the other cam-surface, a collar on the screw to limit the action of the cams and means for actuating the movable jaw consisting of a toothed rack on the movable jaw, a toothed segment pivoted to the base, a rod hinged to an arm of said segment and carrying a stirrup on its end, and an engaging counterpoise lever adj ustably fulcrumed, as and for the purpose described.

In testimony whereof I have hereunto a1":- fixed my signature in the presence of two subscribing witnesses.

JOI'IN W. MCINTYRE.

Witnesses:

S. S. WILLIAMSON, SAMUEL L. TAYLOR. 

